Everyone knows US political class considers its constituents to be everyone outside the US who wants a “better” if not free life from US taxpayers. Examples of existing “border fences” make this clear-photos from National Geographic, Sept. 2017

Above, “A steel wall slices through farmland in Brownsville, Texas, north of the U.S.-Mexico border. Built inland of the actual border—the Rio Grande—it comes to an abrupt end, making it easy to circumvent on foot.”